All the genes, present on a particular chromosome form a linkage group. The number of linkage group of a species correspond to the total number of different chromosomes of that species. It is not simply the number of chromosomes in haploid set. e.g., in human male pairs of autosomes + 1 X -chromosome +1 Y -choromosme, i.e., 24 linkage groups and in female pairs autosomes +2 X -chromosomes, i.e., 23 linkage groups.

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